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Using the whole-cell voltage clamp, we examined acute effects of various agents on Na(+)/Ca(2+) exchange current (I(NCX)) in guinea-pig cardiac ventricular cells and transfected cells. Among the antiarrhythmic drugs, amiodarone, bepridil, dronedarone, cibenzoline, azimilide, and aprindine inhibited I(NCX) in a concentration-dependent manner. We also(More)
Sphingosine-1-phosphate (S1P) is an intracellular second messenger and an extracellular mediator through endothelial differentiation gene (EDG) receptors, which are a novel class of G-protein-coupled receptors. Although EDG has attracted much attention because of its various roles, no selective agonists or antagonists have yet been developed. This could(More)
Sphingosine 1-phosphate (S1P) induces diverse biological responses in various tissues by activating specific G protein-coupled receptors (S1P(1)-S1P(5) receptors). The biological signaling regulated by S1P(3) receptor has not been fully elucidated because of the lack of an S1P(3) receptor-specific antagonist or agonist. We developed a novel S1P(3) receptor(More)
In general, serine protease chymase inhibitors readily decompose in plasma. We previously found that thiazolidine-2,4-dione and thiadiazole derivatives are also unstable. Using a pharmacophore-based database search, we identified a benzo[b]thiophen-2-sulfonamide derivative as a stable chymase inhibitor. Finding a lead compound with adequate activity and(More)
Sphingosine 1-phosphate (S1P) receptors are G-protein-coupled receptors. Among the five identified subtypes S1P1-5, the S1P3 receptor expressed on vascular endothelial cells has been shown to play an important role in cell proliferation, migration, and inflammation. A pharmacophore-based database search was used to identify a potent scaffold for an S1P3(More)
We have identified a new class of chymase inhibitor through a substituent analysis of MWP00965, which we previously discovered by in silico screening. TY-51076 (7) showed high potency (IC(50)=56 nM) and excellent selectivity for chymase compared to chymotrypsin and cathepsin G (>400-fold). The synthesis and structure-activity relationship of this class are(More)
Sphingolipid metabolites such as sphingosine regulate cell functions including cell death and arachidonic acid (AA) metabolism. D-erythro-C18-Sphingosine-1-phosphate (D-e-S1P), a sphingolipid metabolite, acts as an intracellular messenger in addition to being an endogenous ligand of some cell surface receptors. The development of S1P analogs may be useful(More)
Acute hypotonic stress becomes a threat to the survival of bacteria in the environment. Mechanosensitive channels play an essential role in the maintenance of bacterial cell integrity during hypoosmotic shock. A database search suggested that Campylobacter jejuni, a major worldwide cause of bacterial gastroenteritis in humans, possesses two putative(More)
Sphingosine 1-phosphate (S1P) induces diverse biological responses in various tissues by activating specific G proteincoupled receptors (S1P1–S1P5 receptors). The biological signaling regulated by S1P3 receptor has not been fully elucidated because of the lack of an S1P3 receptor-specific antagonist or agonist. We developed a novel S1P3 receptor antagonist,(More)
Ceramide-1-phosphate (C1P) regulates cellular functions including arachidonic acid (AA) metabolism and modulates cell fate. The mechanism by which C1P is taken up is unclear, and the development of lipophilic analogs may be useful for regulating C1P's actions. We synthesized new mono- and di-methyl-ester (MM and DM, respectively) analogs of C1P with N-acyl(More)